I would suggest that in more cases than we might suspect baptismal records have helped people who needed documentation of their identity. Church records are generally considered to be reliable sources of information. So I would recommend a couple of things.
First, as has already been stated, have some other believers present to witness the baptisms and celebrate with you. Baptisms are a good cause for celebration, and need to be shared.
Also, make sure you produce a written record of the baptisms, and make out a certificate for each candidate. Yes, I know God is the only One who really matters, but such things can be helpful in the future, and a precious testimony to future generations. Somewhere among my siblings we have our grandparents' certificates of several such things, and we treasure them and realize that we are the recipients of the blessings of their faith.
Now as far as whether the person performing the baptism should be a Christian or not, of course to knowingly have an unbeliever perform such a thing would be a mockery. But if the person professes to be a follower of Jesus Christ, performs a baptism, and later turns out to be a fake, well the baptism ought to be considered valid. The candidate confessed his faith and submitted to baptism in good faith, and ought not to be distressed if he discoveres the baptizer wasn't what he professed to be.
I have a desire to see more house churches, but not single family ones, unless it is impossible to find other believers. We need to be connected more closely to each other, and we will have greater need in the near future. Of that I am certain.
May your baptismal service be blessed!
Garryowen